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Burbank, CA, United States

Van Rensselar J.,PR Smart
Tribology and Lubrication Technology | Year: 2012

Most original equipment manufacturers recommend or specify oil drain intervals and the type of oil. In many cases, oil drain intervals can be extended beyond the maximum level recommended by the vehicle manufacturer. Aside from the real possibility of being able to extend drain intervals, oil analysis can be a powerful predictive maintenance tool. A discussion covers the benefits of predictive maintenance; types of maintenance approaches; trend analysis vs. individual reports; recommended oil drain interval extensions; considerations why predictive analysis is more important in some industries than in other; oil degradation standards and newer tests; and common user pitfalls regarding predictive maintenance programs. Source

Van Rensselar J.,PR Smart
Tribology and Lubrication Technology | Year: 2010

Wind turbines produce a significant amount of energy for a relatively small cost and with very little disruption to the environment. Modern wind turbines are designed to work most efficiently at wind-speeds of about 25 mph. A 1.5-mw wind turbine will annually displace about 3,000 tons of carbon dioxide generated by nonrenewable energy sources like coal. From an environmental perspective, the fact that wind turbines do not create any carbon-dioxide emissions puts them miles ahead of all nonrenewable energy sources. Most industrial gearboxes work by converting high speed and low torque to low torque and high speed, but wind turbine gearboxes work the opposite way by converting low speed and high torque to low torque and high speed. High loads due to wind gusts and inner-turbine vibrations are the norm. Intermediate bearing bodies vibrate against the outer and inner-rings causing the grease to squeeze out of highly loaded contact areas. Source

Van Renssela J.,PR Smart
Tribology and Lubrication Technology | Year: 2015

Experts share their views on the factors that are considered in developing engine oil engine tests. They state that the process starts with the selection of the test type. Field tests are the truest measure of oil's performance, but they might not assess relative severity, might be difficult to reproduce, are expensive and lengthy and can be difficult to monitor and control. The test is usually remote and difficult to oversee, and due to this, details such as oil color coding are extremely important when performing such tests. Source

Van Rensselar J.,PR Smart
Tribology and Lubrication Technology | Year: 2015

Contact mechanics is a critical aspect of tribology, though it doesn't have the status of being the same. It lays the foundation for race-way profile design and surface roughness specifications. Contact mechanics includes compressive, adhesive and frictional forces, but tribology is mostly concerned with frictional mechanics, which is a sub-discipline of contact mechanics. It is the study of the deformation of objects in the presence of frictional forces. Surface engineering, as a method of improving the friction and lubrication performance of mechanical components, is a relatively new direction for tribology. Micro-elastohydrodynamic lubrication (EHL) concepts and models are now being used not only to understand the simple interaction of fluid and surface, but also as a tool to model the service life of mechanical components. Source

Van Rensselar J.,PR Smart
Tribology and Lubrication Technology | Year: 2011

The use of advanced ultra high strength steel (A-UHSS) by automobile makers is revolutionizing the automotive industry due to its ability to provide reduced product weight, reduced cost, better crash performance and streamlined manufacturing process consolidation. While A-UHSS allows parts to be thinner, some parts, like exterior panels, are already so thin - less than a millimeter or 1/25 of an inch -that lack of rigidity becomes an issue. In other words, no matter how strong the steel is, there is a thinness threshold. As A-UHSS becomes the new standard for auto manufacturing, understanding how well the lubricant works with the material and tooling design becomes critical. Using lubricants designed for A-UHSS grades is important for a number of reasons, not the least of which is that high press forces lead to higher temperatures that can cause some lubricants to break down or burn. Source

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